android - Androidx RecyclerView中ViewHolder的问题
问题描述
在androidX中,当我制作时,我RecyclerView Adapter
无法将 ViewHolder 更改为我的私人 ViewHolder。请看这段代码:
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
}
当我RecyclerView.ViewHolder
像这样将其更改为我的高级 ViewHolder 时:
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView name;
ImageView image;
public MyViewHolder(View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.name);
image = (ImageView) itemView.findViewById(R.id.image);
}
}
onBindViewHolder完全崩溃了。我怎么解决这个问题?
编辑放置 ViewHolder 代码:
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
public class CountryImageAdapter extends RecyclerView.Adapter {
ArrayList personNames;
ArrayList personImages;
Context context;
public CountryImageAdapter(Context context, ArrayList personNames, ArrayList personImages) {
this.context = context;
this.personNames = personNames;
this.personImages = personImages;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
// infalte the item Layout
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.sample_gridlayout, parent, false);
// set the view's size, margins, paddings and layout parameters
MyViewHolder vh = new MyViewHolder(v); // pass the view to View Holder
return vh;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.name.setText(personNames.get(position));
holder.image.setImageResource(personImages.get(position));
// implement setOnClickListener event on item view.
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// open another activity on item click
Intent intent = new Intent(context, ListOfClickActivity.class);
intent.putExtra("TAG", "Country=" + personImages.get(position));
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return personNames.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
// init the item view's
TextView name;
ImageView image;
public MyViewHolder(View itemView) {
super(itemView);
// get the reference of item view's
name = (TextView) itemView.findViewById(R.id.name);
image = (ImageView) itemView.findViewById(R.id.image);
}
}
}
解决方案
你必须ViewHolder
在你CountryImageAdapter
的工作中使用你的预付款。
public class CountryImageAdapter extends RecyclerView.Adapter<CountryImageAdapter.MyViewHolder> {
....
public CountryImageAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
....
}
@Override
public void onBindViewHolder(@NonNull CountryImageAdapter.MyViewHolder holder, int position) {
....
}
}
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